By Maritime and Coastguard Agency
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Extra info for Radio Installations on GMDSS Ships Notice to all Classification Societies and Radio Surveyors
18 hours on cargo ship and for 36 hours on passenger ship. 3 Reserve source of energy 1. 702(17), as applicable. It usually consists of rechargeable batteries and is used to supply the communication equipment in the event of failure of the ship’s mains and emergency source of electrical power. All passenger ships irrespective of size and cargo ships of 300 gt. and upwards should have a reserve source or sources of energy for the operation of the basic equipment, and the duplicated equipment if such equipment is required.
6. Copper bars and straps should be brazed to the steel bulkhead in order to eliminate corrosion and vibration and make a good earth connection. 7. Great care should be taken when earthing radio equipment on ships with aluminium superstructures in order to avoid galvanic corrosion. An approved and acceptable method of earthing should be used on such vessels. Note: - Insufficient earthing of the power amplifier may lead to capacitive and inductive connections between power cables etc. and cause interference to fire alarms, navigational equipment, inter-com.
Both the alarm condition and indication should reset automatically when normal charging condition has been restored. Failure of the alarm system should not interrupt the charging or discharging of batteries. 6. The automatic charger should be operational within five seconds of switching on or after a power supply interruption. 7. The automatic charger should be so designed and constructed that it is protected against damage resulting from disconnection the batteries or, with the battery disconnected, shortcircuiting the battery connection.